Zona is a skin disease caused by the Varicella Zoster virus, which also causes chickenpox. The virus remains hidden in people who had chickenpox and can be reactivated by a number of factors, causing the disease named Zona. The virus comes to the skin through the nerves and forms skin lesions of the disease in a specific and usually limited area. Skin lesions occur most commonly in the form of water bubbles in groups on the red background. Zona usually causes disease on one side of the body, lesions on the right or on the left, very rarely on both sides. The disease usually recovers in 15-20 days, and rarely leaves a trace. Zona may repeat, but the probability of recurrence is low, and the risk of recurrence is high when the immune system is weak. Zona is not infected from one person to another but only in close contact, those who have not passed zona before, at that time Zona transmitted to chickenpox. Antiviral drugs, painkillers, dressings, and creams are used in treatment, and the use of antiviral drugs within the first 72 hours is important.

In addition to the skin disease, "zona" can also refer to other anatomical zones or layers, such as the zona pellucida. It can also be a synonym for shingles, which is another name for the skin disease caused by the Varicella Zoster virus.